Normal
I was on the third cruise when the Millennkium was new. I had a great corner aft balcony cabin. We smelled sewer gas way back then. Is was occasionally inside the cabin and in the hallway. We had some Lysol spray. I think there is a problem with the ventilation and plumbing. It's not that bad. It was one of the best cruises we ever had and we have sailed over 30 times.